In 1998, WPD South West was formed from the demerger of the electricity distribution arm of SWEB.

[1] In September 2000, the American energy company PPL Corporation purchased Hyder for £565m and sold Welsh Water and other interests, leaving the electricity distribution arm Infralec which was renamed WPD South Wales.

[citation needed] In May 2022, WPD made a £14.9 million voluntary redress payment after an investigation by industry regulator Ofgem found shortfalls in the company's implementation of its obligations to vulnerable customers.

[6] In March 2021, PPL announced a swap with National Grid in which it divested WPD and acquired Narragansett Electric of Rhode Island.

[7] The acquisition was completed in June 2021,[8] and approved by the Competition and Markets Authority in September of that year.